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No Power To Headunit/amp

mrgilly

By mrgilly,
in Car Audio & Electrical

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mrgilly Proficient

mrgilly

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Posted

Hi all,

Took all my audio gear out to go to the track a while back, threw it all back in the other day and no go! Didn't think anything of it, til the other night I tried all the fuses I could find (audio under dash, inline from battery, amp, headunit). All seemed ok, so I tried pulling out and reseating every cable I could find. I went for a quick drive to pick someone up, came back to get back into troubleshooting, unhooked the battery and off we go.

I have an issue with my fine motor skills and sometimes I just drop things - once such incidence occured causing me to touch the rem line on either the pos or gnd outlets on the amp. I'm not sure which, I just know there was a spark. Instantly I dropped everything (literally) and checked the battery - stupid me in my rush had disconnected the terminal, but not secured it away from the battery and it was resting against neg...

After berating myself for being so foolish I set about looking to resolve any further problems I'd caused - only the fuse from the battery had blown - all others were OK.

I'm having a look at it now and I have no idea what else it could be? Are there any other under-dash fuses I should check?

Thanks in advance, I've spent quite a while on this and seem to be stuck :)

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Howie Grand Master

Howie

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Posted

Does your headunit power up? That'd be the first place to start as it's the source.

If not, check the acc/ign fuses under the dash. And if there is a fuse on the direct power line (usually yellow line) check that.. you may have to pull the deck out.

If the h/u does power up, check that the remote wire is working. On the amp end, check with a testing light to see the remote wire comes on when the headunit powers up.

If that does come on, and you're seeing battery power to the amp. Then see if the internal fuse on the amp is busted. If it is replace, if it ain't then you could have a dead amp.

Conversely, if the amp powers up, recheck the speaker leads.

mrgilly Proficient

mrgilly

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Posted (edited)

sky017: As mentioned above, I already replaced the fuse near the battery.

Howie: I've already checked the audio fuse, however I'll check more fuses under the dash... at the moment I have no HU power, let alone amp. I already have the deck out and can't find any inline fuse behind there. I've had the HU out a few times, the install was done by Gold Coast Car Sound, and I was never happy with it (they used shitty RCA's and were generally just wankers).

Thanks guys

Edited by mrgilly
Howie Grand Master

Howie

Posted
Posted (edited)

If you still can't find any blown fuses under the dash, take the h/u out - and run a testing light over the power & ign wires. If you're seeing power, it could be a blown deck.. but i say your chances of that are pretty low. Also check if your deck has an internal fuse.

edit: just read your updated post. Your 12volt power should always be fused - obviously because it's a live wire.

let us know how you get on buddy. cheers.

Edited by Howie
mrgilly Proficient

mrgilly

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Posted (edited)

I'll do the fuse testing in the morning, after losing patience with the car earlier I went back to building my server... now it's time to sleep.

I already checked the fuse in the back of the HU and it's fine.

The 12V line from the battery is fused next to the factory under-bonnet fusebox, if that's what you mean

Cheers

Edited by mrgilly

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